/Engine/Plugins/Runtime/RigVM/Source/RigVMDeveloper/Public/RigVMModel/RigVMGraph.h
Returns the root / top level parent graph of this graph (or this if it is the root graph)
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=RigVMGraph) [URigVMGraph](API\Plugins\RigVMDeveloper\RigVMModel\URigVMGraph) * GetRootGraph() const